When performing packet capture on a Cisco Secure Firewall Threat Defense (FTD) device, ensuring that the allocated memory is sufficient is crucial for capturing all necessary traffic during a specified capture session. If users experience issues accessing a server and the engineer suspects not all traffic was collected, it indicates that the current memory allocation might not be enough to store the entire capture data for the 15-minute session.
Steps:
* Check the current memory allocation for packet captures on the FTD device.
* Increase the memory allocation if it is insufficient to handle the volume of traffic expected during the capture session.
This ensures that all relevant traffic is captured and can be analyzed to diagnose and resolve the network issue.
References: Cisco Secure Firewall Threat Defense Configuration Guide, Chapter on Packet Capture.